【題目】You _______ wash your hands before meals. It is good for your health.
A.may
B.can
C.have to
D.must

【答案】D
【解析】句意: 你在飯前必須要洗手。這有利于健康。may可能,沒有把握的推測;can能,表示能力;have to不得不,表示客觀上必須要做的事;must表示主觀上必須做的事情,根據(jù)It is good for your health.可知這對(duì)你的健康好,自己主觀要求必須洗手,故選D。

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